I chose the Dynomax mufflers because I wanted something more mild at idle and cruising speeds, and something that would open up and get loud when I crack the throttle / make pass etc. They are a bit mild tempered at idle, but at WOT, you really hear the engine scream. They don't really mask anything or create any boominess like flowmaster achieves.

I chose a set with an opposite off-set of the entrance and exit which I believe has the best flow characteristics internally. I'm also running an X pipe as well. While it does sound more mild than my past setups, I like it.